JPH09216295A - Manufacture of synthetic resin component - Google Patents
Manufacture of synthetic resin componentInfo
- Publication number
- JPH09216295A JPH09216295A JP2762596A JP2762596A JPH09216295A JP H09216295 A JPH09216295 A JP H09216295A JP 2762596 A JP2762596 A JP 2762596A JP 2762596 A JP2762596 A JP 2762596A JP H09216295 A JPH09216295 A JP H09216295A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- powder
- tensile stress
- component
- compressive stress
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、合成樹脂製部品に
残留する引張応力によってひび割れが生じるのを防ぐ合
成樹脂製部品の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a synthetic resin part which prevents cracks from being caused by residual tensile stress in the synthetic resin part.
【０００２】[0002]
【従来の技術】従来、金型成形により形成した合成樹脂
製部品の角部や、合成樹脂製部品に穴開け加工などの機
械加工を施すことによって形成される加工部には、引張
応力が残留することが知られている。金型成形により形
成した角部は、主に成形時のひけに起因して引張応力が
生じ、機械加工を施すことによって形成した加工部は、
刃によって加工面が引っ張られることに起因して引張応
力が生じる。2. Description of the Related Art Conventionally, tensile stress remains at the corners of synthetic resin parts formed by die molding and the processed parts formed by mechanical processing such as punching of synthetic resin parts. Is known to do. The corners formed by die molding mainly generate tensile stress due to sink marks during molding, and the machined parts formed by machining are
Tensile stress is generated due to the work surface being pulled by the blade.
【０００３】引張応力が残留していると、合成樹脂製部
品の表面が角張って凹む部分にこの引張応力が集中し、
経年変化によりこの凹部を始点として割れが発生するこ
とがある。これを図３によって説明する。When the tensile stress remains, the tensile stress concentrates on the part where the surface of the synthetic resin part is angularly depressed,
Due to aging, cracks may occur starting from this recess. This will be described with reference to FIG.
【０００４】図３は引張応力が残留することに起因して
割れが生じた合成樹脂製部品の一部を示す図である。同
図において、１はポリカーボネート樹脂からなる板部品
を示している。この板部品１の角部には、刃を回転させ
て被加工物を切削する構成の加工機によって加工面が正
方形となるように座ぐり部２を形成するとともに、この
座ぐり部２の中心に位置づけられるようにドリルによっ
て丸穴３を穿設している。この丸穴３は、図示してない
ボルトを挿通してこの板部品１を他の部品に固定するた
めに設けている。FIG. 3 is a view showing a part of a synthetic resin part in which a crack is generated due to residual tensile stress. In the figure, reference numeral 1 denotes a plate component made of polycarbonate resin. A counterbore 2 is formed at a corner of the plate component 1 by a processing machine configured to rotate a blade to cut an object to be machined so that a machined surface becomes a square, and a center of the counterbore 2 is formed. A round hole 3 is bored by a drill so as to be positioned at. The round hole 3 is provided to insert a bolt (not shown) to fix the plate component 1 to another component.
【０００５】このように合成樹脂製板部品に機械加工を
施すと、加工面に引張応力が残留し、表面が角張って凹
む部分、すなわちこの板部品１における座ぐり部２の角
と対応する部位や、丸穴３の切削面（穴壁面）にドリル
の痕跡となって現れる微細な凹み傷に引張応力が集中
し、スクリューあるいはボルトを取付け長時間が経過す
ると前記応力集中部分に割れ４が生じる。なお、座ぐり
部２に生じる割れ４は、座ぐり部２を金型成形によって
形成しても同様に発生する。When the synthetic resin plate component is machined in this manner, tensile stress remains on the machined surface and the surface is angularly recessed, that is, the portion corresponding to the corner of the counterbore 2 of the plate component 1. Alternatively, tensile stress concentrates on minute dents that appear as traces of a drill on the cutting surface (hole wall surface) of the round hole 3, and cracks 4 occur in the stress-concentrated portion when a screw or bolt is attached for a long time. . The crack 4 generated in the spot facing portion 2 also occurs when the spot facing portion 2 is formed by die molding.
【０００６】前記加工部に割れが生じると、板部品１の
取付け部分の耐久性や信頼性が低下するので、例えば穴
開け加工を合成樹脂製部品に施す場合には、割れが生じ
るのを抑えるために以下に説明する二通りの手法を採用
している。 （１）加工部に水、石鹸水、軽油や菜種油などの潤滑性
の高い油を供給しながら加工を行う。すなわち、加工部
に潤滑剤を供給することにより摩擦抵抗を低減させると
ともに加工部を冷却する。この手法を採ると、圧縮空気
を使用したり、ドリルなどの回転する刃を使用して穴開
け加工を行うに当たって、穴壁面が滑らかになり、残留
する引張応力が一箇所に集中するのを抑えることができ
る。また、ドリルを使用する場合に、摩擦熱により合成
樹脂材が溶融し、切削されない状態でドリルが押し込ま
れることにより大きな引張応力が生じるのを防ぐことが
できる。 （２）前記潤滑剤を使用して機械加工を行った後、合成
樹脂製部品を高温雰囲気中に予め定めた時間だけ置く。
すなわち、合成樹脂製部品にアニーリング処理を施す。
この処理を行うと、加工部に残留している引張応力を分
散させることができる。合成樹脂製部品の材料としてポ
リカーボネート樹脂を用いる場合には、前記高温雰囲気
の温度を１２０〜１３０℃とし、高温雰囲気中に置く時
間を板厚１mm当たり１時間程度としている。なお、金型
成形により角張った凹部が形成された合成樹脂製部品
は、前記アニーリング処理のみを行うことがある。If a crack is formed in the machined portion, the durability and reliability of the mounting portion of the plate component 1 will be deteriorated. Therefore, for example, when a hole is drilled in a synthetic resin component, the crack is prevented from occurring. Therefore, the following two methods are adopted. (1) Processing is performed while supplying water, soapy water, highly oily oil such as light oil and rapeseed oil to the processing section. That is, by supplying a lubricant to the processed portion, the frictional resistance is reduced and the processed portion is cooled. By adopting this method, when using compressed air or using a rotating blade such as a drill, the wall surface of the hole becomes smooth and the residual tensile stress is prevented from concentrating in one place. be able to. Further, when a drill is used, it is possible to prevent a large tensile stress from being generated by the synthetic resin material being melted by frictional heat and being pushed in the uncut state. (2) After performing machining using the lubricant, the synthetic resin part is placed in a high temperature atmosphere for a predetermined time.
That is, the synthetic resin part is annealed.
When this treatment is performed, the tensile stress remaining in the processed portion can be dispersed. When a polycarbonate resin is used as the material of the synthetic resin part, the temperature of the high temperature atmosphere is 120 to 130 ° C., and the time of placing in the high temperature atmosphere is about 1 hour per 1 mm of plate thickness. Incidentally, the synthetic resin part in which the angular recess is formed by molding may be subjected to only the annealing treatment.
【０００７】[0007]
【発明が解決しようとする課題】しかるに、上述したよ
うに機械加工時に加工部に潤滑剤を供給したり、アニー
リング処理を施したとしても、引張応力が残留すること
に起因して割れが生じるのを完全に阻止することはでき
ず、スクリューあるいはボルトで締め付けた後２〜３年
経過すると割れが生じることがあった。However, as described above, even if the lubricant is supplied to the machined portion during the machining or the annealing treatment is performed, the cracks are generated due to the residual tensile stress. Cannot be completely prevented, and cracks may occur 2-3 years after tightening with screws or bolts.
【０００８】本発明はこのような問題点を解消するため
になされたもので、引張応力が残留することにより割れ
が生じるのを確実に阻止できるようにすることを目的と
する。The present invention has been made to solve the above problems, and an object thereof is to reliably prevent cracking due to residual tensile stress.
【０００９】[0009]
【課題を解決するための手段】本発明に係る合成樹脂製
部品の製造方法は、合成樹脂製部品における引張応力が
残留する部位に、粉体を混入させた液体を吹き付け、圧
縮応力を残留させるものである。この製造方法を採用す
ると、割れの始点となる角部に引張応力に加えて圧縮応
力も残留するから、この圧縮応力によって前記角部の変
形が抑えられる。In the method for manufacturing a synthetic resin part according to the present invention, a liquid mixed with a powder is sprayed on a part of the synthetic resin part where a tensile stress remains to leave a compressive stress. It is a thing. When this manufacturing method is adopted, not only tensile stress but also compressive stress remains at the corner that is the starting point of cracking, so that the compressive stress suppresses deformation of the corner.
【００１０】ここでいう合成樹脂製部品における引張応
力が残留する部位とは、機械加工を施した機械加工部
や、金型成形により形成した角部のことをいう。また、
粉体を混入させた液体は、前記引張応力が残留する部位
の周辺部分をも含む範囲に吹き付ける。The part where the tensile stress remains in the synthetic resin part as used herein means a machined part that is machined or a corner part formed by die molding. Also,
The liquid mixed with the powder is sprayed on a range including the peripheral portion of the portion where the tensile stress remains.
【００１１】[0011]
【発明の実施の形態】以下、本発明に係る合成樹脂製部
品の製造方法を図１および図２によって詳細に説明す
る。図１は本発明に係る合成樹脂製部品の製造方法を実
施するに当たり使用した板部品の平面図、図２は図１に
おけるII−II線断面図である。これらの図において前記
図３で説明したものと同一もしくは同等部材について
は、同一符号を付し詳細な説明は省略する。BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a synthetic resin part according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a plan view of a plate component used in carrying out the method for manufacturing a synthetic resin component according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. In these figures, the same or equivalent members as those described in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.
【００１２】これらの図に示す板部品１は、電子部品の
前面板を構成するものであり、透明性を有するポリカー
ボネート樹脂によって平面視において長方形となるよう
に形成し、四隅に座ぐり部２を切削加工によって正方形
となるように形成するとともに、この座ぐり部２の中央
に取付ボルト用丸穴３をドリルによって穿設している。
座ぐり部２および丸穴３を形成する機械加工を行った状
態では、この板部品１の座ぐり部２およびその周辺部に
は引張応力が残留している。A plate component 1 shown in these figures constitutes a front plate of an electronic component, and is formed of a transparent polycarbonate resin so as to have a rectangular shape in a plan view, and counterbore portions 2 are formed at four corners. The cutting hole is formed into a square shape, and a round hole 3 for a mounting bolt is formed in the center of the spot facing portion 2 by a drill.
In the state in which the spot facing portion 2 and the round hole 3 are machined, tensile stress remains in the spot facing portion 2 of the plate component 1 and its peripheral portion.
【００１３】この板部品１を前記前面板の製品とするに
は、上述したように座ぐり部２と丸穴３を全て形成した
後、先ず、この板部品１の上面における図１中に右下が
りの平行斜線で示した範囲をマスキングテープ（図示せ
ず）によって覆い、この板部品１の四隅のみを露出させ
る。次に、後述する粉体吹き付け処理を行い、その後、
洗浄、マスキング除去作業などを行う。マスキングテー
プによって前記範囲を覆うのは、この板部品１の透明性
が後工程で粉体吹き付け処理を行うことによって損なわ
れるのを防ぐためである。In order to make this plate part 1 a product of the front plate, after forming the counterbore 2 and the round hole 3 as described above, first, the upper surface of the plate part 1 on the right side in FIG. The area shown by the downward parallel diagonal lines is covered with masking tape (not shown) to expose only the four corners of the plate component 1. Next, a powder spraying process described below is performed, and thereafter,
Perform cleaning and masking removal work. The masking tape covers the range to prevent the transparency of the plate component 1 from being impaired by performing a powder spraying process in a later step.
【００１４】また、マスキングテープによって覆わない
部分（露出させる部分）の大きさは、この実施の形態で
は縦、横の長さが両方とも座ぐり部２の各辺の２倍とな
るようにしている。なお、座ぐり部２の一辺の長さは、
この実施の形態では丸穴３の穴径の２倍としている。In this embodiment, the size of the portion not exposed by the masking tape (exposed portion) is such that both the vertical and horizontal lengths are twice the sides of the counterbore 2. There is. The length of one side of the spot facing part 2 is
In this embodiment, the diameter of the round hole 3 is twice.
【００１５】前記粉体吹き付け処理は、微細な粉体（図
示せず）を水に混合させてなる吹き付け剤を板部品１の
四隅の前記露出面に吹き付け方向が前記上面に対して垂
直になるように上方から圧力をもって吹き付けることに
よって行う。この処理を行うと、板部品１の露出面とな
る部位が粉体の衝突により圧縮され、吹き付け終了後に
前記衝突部分に圧縮応力が残留する。すなわち、座ぐり
部２およびその周辺部分と、丸穴３の周辺部分に圧縮応
力が残留する。In the powder spraying process, a spraying agent prepared by mixing fine powder (not shown) with water is sprayed onto the exposed surfaces at the four corners of the plate component 1 so that the spraying direction is perpendicular to the upper surface. So that it is sprayed with pressure from above. When this treatment is performed, the exposed surface of the plate component 1 is compressed by the collision of the powder, and the compressive stress remains in the collision after the end of the spraying. That is, compressive stress remains in the spot facing portion 2 and its peripheral portion, and in the peripheral portion of the round hole 3.
【００１６】したがって、座ぐり部２の角張るように凹
む部分や、丸穴３の穴壁面に形成された微細な凹み傷な
どのような割れの始点となる角部に、引張応力に加えて
圧縮応力も残留するから、この圧縮応力によって前記角
部の変形が抑えられる。Therefore, in addition to the tensile stress, the corner of the counterbore 2 which is concave like a square or the corner which is the starting point of a crack such as a minute dent scratch formed on the wall surface of the round hole 3 is applied. Since the compressive stress also remains, the compressive stress suppresses the deformation of the corners.
【００１７】本発明を創作するに当たり発明者が行った
実験によれば、粉体としてガラスビーズ砥粒〔岳南光機
（株）製＃２４０、粒径６２〜７４μｍ〕を使用し、こ
のガラスビーズ砥粒と水とを容積比で２対１の割合で混
合させてなる吹き付け剤を、ノズル径が４．５mmの吹き
付け用ノズルから吹き付け圧力を４〜７kg／cm2 とし、
ノズル先端と板部品１との間隔（吹き付け距離）を４〜
１２cmとして噴射させることによって、最もよい結果が
得られた。特に、前記吹き付け距離が４〜１２cmの範囲
にあると、被吹き付け面の全域にガラスビーズ砥粒がむ
らなく吹き付けられて圧縮応力を略均等に残留させるこ
とができる。According to an experiment conducted by the inventor in creating the present invention, glass bead abrasive grains [# 240 manufactured by Gakunan Koki Co., Ltd., particle size 62 to 74 μm] were used and the glass beads were used. A spraying agent obtained by mixing abrasive grains and water in a volume ratio of 2: 1 is sprayed from a spraying nozzle having a nozzle diameter of 4.5 mm to a spraying pressure of 4 to 7 kg / cm 2 ,
The interval (spray distance) between the nozzle tip and the plate component 1 is 4 to
Best results were obtained by spraying as 12 cm. Particularly, when the spraying distance is in the range of 4 to 12 cm, the glass bead abrasive grains are uniformly sprayed over the entire surface to be sprayed, and the compressive stress can be left substantially evenly.
【００１８】なお、この実験では、板部品１として、幅
Ｗが２００mm、長さＬが３００mm、厚みが３mm、座ぐり
部２の深さが１mmのものを用いた。また、丸穴３の穴径
ａを４φ、座ぐり部２の一辺の長さを８mm、前記露出面
の一辺の長さを１６mmとした。In this experiment, the plate component 1 used had a width W of 200 mm, a length L of 300 mm, a thickness of 3 mm, and a counterbore 2 had a depth of 1 mm. Further, the hole diameter a of the round hole 3 was 4φ, the side length of the spot facing portion 2 was 8 mm, and the side length of the exposed surface was 16 mm.
【００１９】また、この実験は、下記の表１に示すよう
に、ガラスビーズ砥粒と水の混合比を１対１、２対１、
３対１としたそれぞれの場合について行うとともに、吹
き付け圧力の条件を４〜５kg／cm2 未満、５〜６kg／cm
2未満、６〜７kg／cm2未満と変え、さらに、吹き付け距
離の条件を６±２cm、１０±２cmと変えて行った。割れ
が生じるか否かを判定するには、粉体吹き付け処理が終
了した板部品１を四塩化炭素溶液に浸漬させて２４時間
放置し、目視により割れの発生の有無を調べることによ
って行った。なお、四塩化炭素溶液に合成樹脂製部材を
浸漬させると、この合成樹脂製部材の表面の割れの始点
となる微小な傷などが増長されて割れが拡がることが知
られている。In this experiment, as shown in Table 1 below, the mixing ratio of the glass bead abrasive grains and water was 1: 1, 2: 1.
Do the same for each case of 3 to 1, and the conditions of spraying pressure are less than 4-5kg / cm 2 , 5-6kg / cm
It was changed to less than 2 and less than 6 to 7 kg / cm 2 , and the spray distance was changed to 6 ± 2 cm and 10 ± 2 cm. To determine whether or not cracking occurs, the plate component 1 after the powder spraying treatment was dipped in a carbon tetrachloride solution, allowed to stand for 24 hours, and visually checked for the occurrence of cracking. It is known that when a synthetic resin member is immersed in a carbon tetrachloride solution, minute scratches or the like, which are the starting points of cracks on the surface of the synthetic resin member, are increased and the cracks spread.
【００２０】[0020]
【表１】 [Table 1]
【００２１】表１から、ガラスビーズ砥粒と水の混合比
が２対１の場合は吹き付け圧力と吹き付け距離の条件が
前記何れの場合であっても割れが発生しないことが分か
る。また、前記混合比が１対１の場合であっても、吹き
付け圧力が相対的に高くかつ吹き付け距離が相対的に短
いとき（吹き付け圧力６〜７kg／cm2 、吹き付け距離４
〜８cm）、すなわちガラスビーズ砥粒が板部品１に衝突
するときの圧力が相対的に高いときには、割れが発生し
ないことが分かる。From Table 1, it can be seen that when the mixing ratio of the glass bead abrasive particles and water is 2: 1 no cracking occurs even if the conditions of spraying pressure and spraying distance are any of the above. Even when the mixing ratio is 1: 1, when the spraying pressure is relatively high and the spraying distance is relatively short (spraying pressure 6 to 7 kg / cm 2 , spraying distance 4
8 cm), that is, when the pressure at which the glass bead abrasive particles collide with the plate component 1 is relatively high, no cracking occurs.
【００２２】さらに、粉体吹き付け処理を行う部分の範
囲を縦、横の長さが両方とも座ぐり部２の各辺の少なく
とも２倍となるように設定することが、割れの発生を確
実に防ぐ上で必要であると考えられる。これは、引張応
力が残留する部位の全域に圧縮応力を残留させるためで
ある。Further, it is possible to ensure the occurrence of cracks by setting the range of the portion where the powder spraying process is performed so that both the vertical and horizontal lengths are at least twice each side of the spot facing portion 2. It is considered necessary to prevent it. This is because the compressive stress remains in the entire region where the tensile stress remains.
【００２３】上述した実験において割れが発生しなかっ
た板部品１にヒートショック試験を繰り返し行ったとこ
ろ、下記の表２に示すようにヒートショック試験を７回
実施しても割れが生じないことが判明した。なお、この
ヒートショック試験は、−１０℃の環境に１２時間放置
した後、５５℃の環境に１２時間放置することを１サイ
クルとして行った。また、このときには、図１に示した
板部品１に従来のアニーリング処理を施したものにもヒ
ートショック試験を実施し、その結果を比較した。When the heat shock test was repeatedly performed on the plate component 1 in which no crack was generated in the above-mentioned experiment, as shown in Table 2 below, even if the heat shock test was performed seven times, no crack was generated. found. In addition, this heat shock test was performed by leaving it in an environment of −10 ° C. for 12 hours and then leaving it in an environment of 55 ° C. for 12 hours as one cycle. At this time, the heat shock test was also performed on the plate component 1 shown in FIG. 1 that had been subjected to the conventional annealing treatment, and the results were compared.
【００２４】[0024]
【表２】 [Table 2]
【００２５】なお、合成樹脂製板部品１の材質はポリカ
ーボネートに限定されることはなく、どのような合成樹
脂材料であっても同様の効果が得られる。また、粉体吹
き付け処理を行う部分は、機械加工された部分の他に、
金型成形によって形成された角部であってもよく、しか
も、どのような形状でもよい。The material of the synthetic resin plate component 1 is not limited to polycarbonate, and the same effect can be obtained with any synthetic resin material. In addition to the machined parts,
It may be a corner formed by die molding and may have any shape.
【００２６】さらに、吹き付け処理を行う範囲は、上述
した実施の形態では座ぐり部２の形状が正方形であるた
めにこれと相似形となるような正方形としたが、例え
ば、図１に示す板部品１において座ぐり部２を形成せず
に丸穴３のみを穿設する場合には、図１中に左下がりの
平行斜線で示した範囲でよい。すなわち、この場合に
は、中心が丸穴３と一致し、半径が丸穴３の穴径ａの２
倍となるような略扇状の範囲に粉体吹き付け処理を行
う。Further, the range of the spraying process is a square which is similar to the square of the counterbore 2 in the above-described embodiment, but the plate shown in FIG. In the case of forming only the round hole 3 in the component 1 without forming the spot facing portion 2, it may be within the range shown by the parallel slanted line descending to the left in FIG. That is, in this case, the center coincides with the round hole 3 and the radius is 2 of the hole diameter a of the round hole 3.
The powder spraying process is performed in a substantially fan-shaped range that doubles.
【００２７】加えて、粉体吹き付け処理に使用する粉体
はガラスビーズ砥粒でなくてもよく、これを混合する液
体も水でなくてよい。粉体の質量、粒径などが前記実施
の形態で用いたガラスビーズ砥粒とは大きく異なるとき
には、吹き付け圧力、吹き付け距離、ノズル径などを粉
体に適合するように設定することはいうまでもない。In addition, the powder used in the powder spraying process need not be glass bead abrasive grains, and the liquid to be mixed with it does not have to be water. When the mass, particle size, etc. of the powder are significantly different from the glass bead abrasive grains used in the above-mentioned embodiment, it goes without saying that the spraying pressure, spraying distance, nozzle diameter, etc. are set to suit the powder. Absent.
【００２８】[0028]
【発明の効果】以上説明したように本発明に係る合成樹
脂製部品の製造方法は、合成樹脂製部品における引張応
力が残留する部位に、粉体を混入させた液体を吹き付
け、圧縮応力を残留させるため、割れの始点となる角部
に引張応力に加えて圧縮応力も残留するから、この圧縮
応力によって前記角部の変形が抑えられる。As described above, in the method for manufacturing a synthetic resin part according to the present invention, a liquid mixed with powder is sprayed on the part of the synthetic resin part where the tensile stress remains, and the compressive stress remains. Therefore, in addition to the tensile stress, a compressive stress remains at the corner that is the starting point of the crack, so that the compressive stress suppresses the deformation of the corner.
【００２９】したがって、粉体を混入させた液体を吹き
付けることによって残留させた圧縮応力より大きな引張
応力が生じない限り、割れが発生することがない。この
ため、本発明に係る製造方法によれば、金型成形により
形成した角部や機械加工部に割れが生じない高品質な合
成樹脂製部品を製造できる。Therefore, as long as a tensile stress larger than the compressive stress left by the spraying of the liquid mixed with the powder is not generated, the crack does not occur. Therefore, according to the manufacturing method of the present invention, it is possible to manufacture a high-quality synthetic resin component in which a corner or a machined portion formed by die molding does not crack.
【図１】 本発明に係る合成樹脂製部品の製造方法を実
施するに当たり使用した板部品の平面図である。FIG. 1 is a plan view of a plate component used for carrying out a method for manufacturing a synthetic resin component according to the present invention.
【図２】 図１におけるII−II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】 引張応力が残留することに起因して割れが生
じた合成樹脂製部品の一部を示す図である。FIG. 3 is a view showing a part of a synthetic resin part in which a crack is generated due to residual tensile stress.
１…板部品、２…座ぐり部、３…丸穴、４…割れ。 1 ... Plate part, 2 ... Counterbore part, 3 ... Round hole, 4 ... Crack.
Claims (3)
における引張応力が残留する部位に、粉体を混入させた
液体を吹き付けることにより、圧縮応力を残留させるこ
とを特徴とする合成樹脂製部品の製造方法。1. A synthetic resin part, characterized in that, after forming a part made of synthetic resin, a compressive stress remains by spraying a liquid mixed with a powder on a part where tensile stress remains in the part. Manufacturing method of parts.
法において、粉体を混入させた液体を、合成樹脂製部品
における機械加工を施した部位であって機械加工部の周
辺部分も含む範囲に吹き付けることを特徴とする合成樹
脂製部品の製造方法。2. The method for manufacturing a synthetic resin part according to claim 1, wherein a liquid mixed with powder is a machined part of the synthetic resin part, which also includes a peripheral part of the machined part. A method for producing a synthetic resin part, characterized by spraying onto a range.
法において、粉体を混入させた液体を、合成樹脂製部品
における金型成形により形成した角部であってこの角部
の周辺部分も含む範囲に吹き付けることを特徴とする合
成樹脂製部品の製造方法。3. The method for manufacturing a synthetic resin part according to claim 1, wherein a liquid mixed with powder is a corner part formed by die molding of the synthetic resin part, and a peripheral part of the corner part. A method for producing a synthetic resin part, which comprises spraying in a range including
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02762596A JP3642864B2 (en) | 1996-02-15 | 1996-02-15 | Manufacturing method for plastic parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02762596A JP3642864B2 (en) | 1996-02-15 | 1996-02-15 | Manufacturing method for plastic parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09216295A true JPH09216295A (en) | 1997-08-19 |
| JP3642864B2 JP3642864B2 (en) | 2005-04-27 |
Family
ID=12226147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02762596A Expired - Fee Related JP3642864B2 (en) | 1996-02-15 | 1996-02-15 | Manufacturing method for plastic parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3642864B2 (en) |
-
1996
- 1996-02-15 JP JP02762596A patent/JP3642864B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3642864B2 (en) | 2005-04-27 |
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